25198035145 has 4 divisors (see below), whose sum is σ = 30237642180. Its totient is φ = 20158428112.

The previous prime is 25198035073. The next prime is 25198035157. The reversal of 25198035145 is 54153089152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17596287801 + 7601747344 = 132651^2 + 87188^2 .

It is a cyclic number.

It is not a de Polignac number, because 25198035145 - 2¹⁷ = 25197904073 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2519803510 + ... + 2519803519.

It is an arithmetic number, because the mean of its divisors is an integer number (7559410545).

Almost surely, 2^25198035145 is an apocalyptic number.

It is an amenable number.

25198035145 is a deficient number, since it is larger than the sum of its proper divisors (5039607035).

25198035145 is an equidigital number, since it uses as much as digits as its factorization.

25198035145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039607034.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 25198035145 in words is "twenty-five billion, one hundred ninety-eight million, thirty-five thousand, one hundred forty-five".